Melt the butter in the microwave in 15-second intervals. Mix the melted butter with graham cookie crumbs, brown sugar, ground ginger, cinnamon, and lemon zest until combined.
Divide the crust mixture evenly into the cupcake liners, filling them halfway. Press down firmly to compact the crust. Refrigerate the tray to set while you prepare the filling.
Place white baking chocolate in a heat-proof bowl and set it over a pot of boiling water. Stir until the chocolate melts completely. Remove from heat and let it cool to room temperature.
Microwave the cream cheese on medium for 10 seconds until spreadable.
In a large mixing bowl, whip the room-temperature butter until fluffy. Add the softened cream cheese and mix until just combined.
Add the cooled melted chocolate, sour cream, ground ginger, cinnamon, nutmeg, cardamom, vanilla extract, and sea salt to the mixing bowl. Gently fold the mixture until smooth and creamy.
Spoon the cheesecake filling evenly over each graham crust. Smooth the tops with a spatula.
Place the tray in the freezer for 15 minutes to firm up, then transfer it to the fridge for at least an hour for the best texture.
Once chilled, carefully remove the cheesecake cups from the tray and peel off the liners. Top with whipped cream and a dusting of cinnamon before serving.